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Removal of Methylene Blue (mb) from Waste Water by Adsorption on Jackfruit Leaf Powder (jlp) in Continuously Stirred Tank Reactor.

T Ahmed
Department of Chemical Engineering and Polymer Science, Shahjalal University of Science and Technology, Sylhe-3114, Bangladesh.

W Noor
Department of Chemical Engineering and Polymer Science, Shahjalal University of Science and Technology, Sylhe-3114, Bangladesh.

O Faruk
Department of Chemical Engineering and Polymer Science, Shahjalal University of Science and Technology, Sylhe-3114, Bangladesh.

M C Bhoumick
Department of Chemical Engineering and Polymer Science, Shahjalal University of Science and Technology, Sylhe-3114, Bangladesh.

M T Uddin
Department of Chemical Engineering and Polymer Science, Shahjalal University of Science and Technology, Sylhe-3114, Bangladesh.

Abstract/ Executive Summary:

Dye contaminated wastewater possess serious threat to the goal of reaching a sustainable environment. Bio adsorbents can be utilized very effectively in removing dye ingredients from wastewater due to their high kinetics and capacity. The study was focused on observing bio adsorbent (jackfruit leaf powder) activity for Methylene Blue adsorption in a Continuous Stirred Tank Reactor (CSTR) for wastewater treatment.Batch and kinetic study of adsorbent were performed. The maximum adsorption capacity at equilibrium was found to be 271 mg/g and adsorption followed Langmuir isotherm. The kinetics study provided evidence of instantaneous adsorption while the zero point charge of the adsorbent was 3.9. The FTIR of the JLP-MB system was carried out to explain the adsorption phenomena with representing groups. The CSTR study was performed under various parameters such as, effect of flow rate, adsorbent dosage, CSTR arrangement and initial concentration. The dye stream first treated in 1st reactor and then its effluent passes into the 2nd reactor and treated again. It was found that the single CSTR removes 30-45 % of the dye depending on the initial concentration, while the series effect removes 70-85 % of the dye overall.

Keywords: Methylene blue (MB), Waste water, Jackfruit leaf powder (JLP), Continuously stirred tank reactor.

Location: Department of Chemical Engineering and Polymer Science, Shahjalal University of Science and Technology, Sylhe-3114, Bangladesh.

Start Date:

End Date:

Program Area: Resource Development and Management

Commodity: Jackfruit

Objectives:

The objective of this study was to find an efficient method of dye removal from waste water in continuous basis by series CSTR system for MB-JLP adsorption as a model.

Methodology:

2.1 Materials: Jackfruit leaf powder was used to study the adsorption of methylene blue in CSTR. Leaves were collected from local area. After collecting the leaves, they were thoroughly cleaned to remove dirt and other earthy particles. Then the leaves were dried in oven at 105o C overnight. Dried leaves were crushed and boiled in water until the removal of its most lignin and coloring components. Boiled leaves then filtered and dried in oven at 105o C for 24 hours and sieved to particles size 45-500µm and stored in a plastic jar for using as an adsorbent.Methylene Blue was purchased from Merck and used as received without further purification. The stock solution of MB was prepared with a concentration of 1000 ppm (1000mg/L) and all other working solutions were prepared by diluting the stock solution with distilled water. 2.2. Methods: To study the effect of important parameters e.g. adsorbent dosage, initial dye concentration, and contact time on the adsorptive removal of MB, batch experiment was conducted on 25±2^o C. In this study six 250 ml stopper bottles were used. Each of them was filled with 200 ml of methylene blue solution of seven different concentrations. A fixed amount of adsorbent was added to each solution. The samples were then shaken with a flask shaker (Stuart Scientific Co. Ltd, Model: SF1, UK) at 450osc/min for 6hrs. Within this time the system reached equilibrium. The solutions were then centrifuged for 5-10 min to settle down the adsorbent. The dye solution was then separated and the concentration of the solution was determined with UV-vispectrophotometer (UV-2600 PC, Manufacture: shimadzu, Made in Japan) at 664 nm wavelength.

Source of Information: IOP Conf. Series: Journal of Physics: Conf. Series 1086 (2018) 012012

Article Link (Online Journal): doi :10.1088/1742-6596/1086/1/012012

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

This study was primarily focused on finding an alternative potential system to treat wastewater by adsorption with a high rate and efficiency in CSTR. Due to the continuous steady-state mode of operation of CSTR; for adsorption purposes, it was required to use an adsorbent with high kinetics and sorption capacity. Jackfruit leaf powder (JLP), for its high kinetics, and comparatively high capacity makes it an outstanding choice for use in CSTR system for treating dye from the waste stream. It was found that, in CSTR, adsorption can be possible with considerable ease by using low-cost natural adsorbent. According to Langmuir isotherm, MB adsorption on JLP was favorable. The maximum sorption capacity of MB onto JLP has been found 271mg/gm. it was relatively higher than another natural low-cost adsorbent except for activated carbon. Another adsorbent with higher kinetics and capacity can be used in CSTR to treat dye-containing waste streams by the adsorption method easily and proficiently.

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